When I get feedback, especially negative, I like to think about it before I respond. And I may take a month to respond.
But I always immediately respond with something like
"Thank you for providing feedback, and thanks for your patience while I think about your feedback, discuss it, and respond appropriately."
At least you then know I'm not ignoring it.
That said, they set the bar pretty high, and now they need to execute.
Well, if they truly have "more imporant things to do than address community ire", then this also means that they agree to take the community's ire.
That's no way to run a modern web-based business for alpha geeks.
Perhaps you should reread that letter:
However, many of us are frustrated. Those of us who run some of the most popular projects on GitHub feel completely ignored by you. We’ve gone through the only support channel that you have given us either to receive an empty response or even no response at all. We have no visibility into what has happened with our requests, or whether GitHub is working on them.
Or in other words, to answer the question I was asked (which was "Did they who filed the letter ask?"), yes, they did ask. Apparently repeatedly.